﻿//
// (C) Copyright 2009 Irantha Suwandarathna (iranthas@hotmail.com)
// All rights reserved.
//

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use _in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions _in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer _in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using EffiProz.Core.Indexes;
using EffiProz.Core.RowIO;
using EffiProz.Core.Errors;
using EffiProz.Core.Navigators;

namespace EffiProz.Core.Persist
{
    public abstract class RowStoreAVL : PersistentStore
    {
        public PersistentStoreCollection manager;
        public Index[] indexList = new IndexAVL[0];
        public CachedObject[] accessorList;

        // for result tables
        public long timestamp;

        public virtual bool isMemory()
        {
            return false;
        }

        public abstract int getAccessCount();

        public abstract void set(CachedObject _object);

        public abstract CachedObject get(int key);

        public abstract CachedObject get(int key, bool keep);

        public abstract CachedObject get(CachedObject _object, bool keep);

        public abstract int getStorageSize(int key);

        public abstract void add(CachedObject _object);

        public abstract CachedObject get(RowInputInterface _in)
        ;

        public abstract CachedObject getNewInstance(int size);

        public abstract CachedObject getNewCachedObject(Session session,
                Object _object);

        public abstract void removePersistence(int i);

        public abstract void removeAll();

        public abstract void remove(int i);

        public abstract void release(int i);

        public abstract void commitPersistence(CachedObject _object);

        public abstract DataFileCache getCache();

        public abstract void setCache(DataFileCache cache);

        public abstract void release();

        public PersistentStore getAccessorStore(Index index)
        {
            return null;
        }

        public virtual CachedObject getAccessor(Index key)
        {

            int position = key.getPosition();

            if (position >= accessorList.Length)
            {
                throw Error.runtimeError(ErrorCode.U_S0500, "RowStoreAVL");
            }

            return accessorList[position];
        }

        public abstract void setAccessor(Index key, CachedObject accessor);

        public abstract void setAccessor(Index key, int accessor);

        public abstract void resetAccessorKeys(Index[] keys);

        /**
         * Basic delete with no logging or referential checks.
         */
        public virtual void delete(Row row)
        {

            for (int i = indexList.Length - 1; i >= 0; i--)
            {
                indexList[i].delete(this, row);
            }
        }

        public void indexRow(Session session, Row row)
        {

            int i = 0;

            try
            {
                for (; i < indexList.Length; i++)
                {
                    indexList[i].insert(session, this, row);
                }
            }
            catch (CoreException e)
            {

                // unique index violation - rollback insert
                for (--i; i >= 0; i--)
                {
                    indexList[i].delete(this, row);
                }

                remove(row.getPos());

                throw e;
            }
        }

        public void indexRows()
        {

            RowIterator it = rowIterator();

            for (int i = 1; i < indexList.Length; i++)
            {
                setAccessor(indexList[i], null);
            }

            while (it.hasNext())
            {
                Row row = it.getNextRow();

                if (row is RowAVL)
                {
                    ((RowAVL)row).clearNonPrimaryNodes();
                }

                for (int i = 1; i < indexList.Length; i++)
                {
                    indexList[i].insert(null, this, row);
                }
            }
        }

        public RowIterator rowIterator()
        {

            if (indexList.Length == 0 || indexList[0] == null)
            {
                throw Error.runtimeError(ErrorCode.U_S0500, "RowStoreAVL");
            }

            return indexList[0].firstRow(this);
        }

        public virtual void lockStore() { }

        public virtual void unlockStore() { }
        
    }
}
